On Thursday, we finished up our notes on uniform circular motion with examples 22 and 23. Students then had the rest of the class to work on Assignment 3.7. On Friday, we started looking at planetary motion and Newton's Law of Universal Gravitation. This law states that there is a force that exists between any two objects that have mass. This force is proportional to their mass and inversely proportional to the square of the distance between the masses. We did examples 24 and 25 which used this law. We then looked at how gravity causes uniform circular motion, particularly with objects in orbit around planets and stars. This is called gravitational motion. It is born from the fact that the centripetal force that causes the motion is supplied by gravity. We derived some interesting relationships with this fact. We then did example 26 but ran out of time to get to Assignment 3.8. We will get there on Tuesday after we finish example 27.
We are one class behind in Period 1. We just began looking at uniform circular motion on Thursday and finished the notes on Friday. On Tuesday we will begin looking at planetary motion. I hope everyone has another good long weekend.
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